SEDL / STP / STP617-EB / STP26934S

Effect of Time at Load on Fatigue Response of [(0/ ± 45/90)^s]² T300/5208 Graphite-Epoxy Laminate

Sendeckyj, GP
Aerospace engineers, Structural Mechanics Division, Air Force Flight Dynamics Laboratory, Wright-Patterson Air Force Base, Ohio

Stalnaker, HD
Aerospace engineers, Structural Mechanics Division, Air Force Flight Dynamics Laboratory, Wright-Patterson Air Force Base, Ohio

Pages: 14    Published: Jan 1977

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Abstract

Results of an experimental program, designed to test a time at load fatigue failure hypothesis for composites, are discussed. In order to minimize the influence of various test and material variables, testing was performed using a trapezoidal loading waveform with constant loading rates and sufficiently long hold times at load to minimize the effect of hysteresis heating. The results indicate that the fatigue life of [(0/ ±45/90)^s]² T300/5208 graphite-epoxy specimens can be explained by using time at load as a fatigue criterion.